Fix issue where killing an enemy resulted in orb being rendered with rat sprite on top

src/core/config/GameConfig.ts

@@ -26,17 +26,30 @@ export const GAME_CONFIG = {
     roomMaxHeight: 10
   },
   
-  enemy: {
-    baseHp: 8,
-    baseAttack: 3,
-    minSpeed: 80,
-    maxSpeed: 130,
-    baseHpPerFloor: 5,
-    attackPerTwoFloors: 1,
+  enemies: {
+    rat: {
+      baseHp: 8,
+      baseAttack: 3,
+      baseDefense: 0,
+      minSpeed: 80,
+      maxSpeed: 110,
+      expValue: 5
+    },
+    bat: {
+      baseHp: 6,
+      baseAttack: 4,
+      baseDefense: 0,
+      minSpeed: 110,
+      maxSpeed: 140,
+      expValue: 8
+    }
+  },
+
+  enemyScaling: {
     baseCount: 3,
     baseCountPerFloor: 3,
-    ratExp: 5,
-    batExp: 8
+    hpPerFloor: 5,
+    attackPerTwoFloors: 1,
   },
   
   leveling: {